Just for the heck of it, I did a calculation of what happens to the mass matrix during the transformation from the Dirac-Pauli representation to the Newton-Wigner representation via Foldy-Wouthuysen. This is shown in:
https://jayryablon.files.wordpress.com/2008/06/foldy-wouthuysen.pdf
Not sure where to go from there, but I’ll be away the rest of the week on vacation, so I’ll take another look when I return.
Interested in any further thoughts anyone may have.
Jay
Leave a Reply